Music video with hen party, what's the song/band?

It's a music video where there are 2 groups of hen party wearing different types of clothes. They are miming the words to the song of the music video and they are behind glass and there are posh people, possibly in a posh restaurant, looking through the glass at them with disgust. At some point the 2 groups are fighting with each other, possibly before they start singing. What is the name of the song and/or band please?